Observe a veteran teacher and her fourth-graders in a mini-lesson on adding detail to narrative writing. Consider the purpose and effectiveness of each part of the lesson and compare your observations with those of another teacher.

Classify the different types of numbers we use, and learn how numbers and operations relate to one another. Start with counting numbers and then add integers, rationals, algebraic, and, finally, real numbers to the line.

Play an animation that incorporates most types of energy transfers and conversions into a chain reaction. Then rerun the animation and answer questions to test your understanding of how energy can travel and change.